Control for volume and tuning of a radio set



Feb. 6, 1940.

J. M. BAXTER CONTROL FOR VOLUME AND TUNING 0F A "RADIO SET Filed slept. 28, 1938 P IEI. l

INVENT OR. y

ggfs.

Mw M,

MUM

Patented Feb. 6, 1940 UNITED .STATES r-aisasss 'f PATENT omer;

poration of Delaware Application September za, 193339,13] Nm 232,153 y ,e

. schm-tcl-19z-ozy, This invention relates to a control-for volume i land tuning 'oral radio set andisparticularly o ""secured thereto a collar l2 and a collar Il. Be-

vtween the gear 29, and the collar 32 there is inadapted for remote control. v One object of the invention is to simplify mechanism required for remote control of tuning and volume. To that end a single electric motor is used for both controls and: means are provided for selectively connecting the motor to operate each control The control of the selecting means vis accomplished 'by 'electrical means which may be operated ata remote station.

Another object ofthelnvention is. to providev electrical control 'means for the motor by which oney control device operates the volumecontrol and another controll device operates the Vtuning control, althoughv a single motor is used for both purposes. l A.

Other objects and features of the. invention will be understood from the accompanying drawing and the following specification and claims:

, Fig. 1 is an elevational view of the apparatus employed'in apreferredrfonn rof the invention and shows both the apparatus at the radio itself yand at a control station with electrical connections shown diagrammatically. Fig. 2 is a sectional view taken on the line 2 2 of Fig. 1.

In the preferred form of the invention illustrated in the drawing there is provided a base plate I which is preferably mountedin any convenient position inside the cabinet l,of the radio to be controlled. Mounted on the base plate I0 there is a reversible motor II adapted to be opi erated in one direction when current is supplied thereto on a pair of 'wires I2 and I3 and adapted to be operated 'in the opposite direction when f current is supplied on the wire I2 and a wire I4.

The motorhas a pinion I5 freely mounted on the shaft thereof and rotatable by a friction clutch I9 of a well known commercial form which automatically engages the pinion when the motor has .attained a predetermined speed.` 'I'he pinion I5 4meshes with a'gear Il mounted on a stub shaft I8. Said stub shaft also carries a pinion I9 meshing with a gear secured to a main drive shaft 2|. The shaft 2I is journaled in a bearing 2Ia secured to the frame of the motor II and is also journaled. in a bushing 22 in turn journaled in a bearing 29 secured to the base plate I0.

f A clutch member 24 is slidably vkeyed on the shaft 2l and is provided with a pin 25 adapted to engage any oneV of anumber of similar pins 26 carried by a clutch co1larr2f| secured tothe sleeve 22. The sleeve 22 has formed thereon a pinion. meshing with a gear 29 whichrisy freelyv resistor o rhmsta't 3| which msb vused im? volume control of the radio. The shaftv l'has serted a discf34 of cork or other suitable friction material." Between the gear 29 and the collar Il lthere is inserted'a lresilient washer 35 adapted to press the gear-.2s against the disc 34 and thus to form a yielding drive connection betweenthe gear 2,9 and shaft 30. By this means, the operation of the motor 'II may turn the rheostat Il in either direction as long as the clutch member 24 is in engagement with the clutch member 2l.

Whenthe rheostat 3| reaches theV end of its travel in either direction, the friction :connection between gear 29 andshaft Ill slips and permits the motor II to continue to operate without damage "to the rheostat.

'I'he clutch-member 24 is provided with teeth '.735 adapted to engage teeth v3l formed on a clutch manner. By means yof this connection, the oper-` ation of the `motor I l .may operate the tuning .condenser ineither ,direction rWhenever the clutch member 24 has been moved into engagement with the clutchmember 38. v

An electromagnet 50. mounted ona magnetic Vcore 5iv is provided with an armature 52 pivoted to said core at 53. 'Ihe armature 52 carries a pin 54 operating in a groove 55 in the clutch member 24.v A tension spring 55 is attached/ to the armature 52 and has its opposite end an'chored to the base plate I 9. Said spring normally biases the armature and the clutch member 24 toward engagement with the clutch member 2l and thus maintains the driving connection between the motor II and the rheostat 3|. When the electromagnet 5 0 is energized however, the. armatui/e v52 is drawn to the left against the vaction of the spring 56 and thus engages the clutchV member 24 with the clutch memberv '35.' The driving connection between. the motor and the `rshaft 44 offa variable vcondenser 45. The shaft 44 carries collarsy 46 and 4l, a friction disc 48 and a resilient Ywasher. together forming a condenser 4l is thus established and the connection of the rheostat 3i is broken.

For control of the motor il and electromagnet 50 there are provided a pair of switches 51 and the panel Il by means of a stem Il extending Y therethrough. 'I'he stem Il carries a disc Il on which there is eccentrically mounted a cylindrical member i5 formed of insulation material. The member 85 is interposed between the leaves Il and Cl and is normally held in the position shown in Fig. 1 by said leaves. In this position no contact exists between any of said leaves. However, when the knob l! is turned clockwise the member Il is moved to engage the leaf Il with the leaf l! and when said knob is turned in the opposite direction leaf l0 is moved to engage leaf Il.

The switch 5B includes resilient contact leaves 61, 6l, 89, 10 and 1|, a knob 1! and a cylindrical insulation member 13 operated by said knob in the same manner as the member li. When knob 12 is moved clockwise, leaf first engages leaf l1. Further movement of the knob engagesleaf 01 with leaf it. Similarly, when the knob 12 is moved in the opposite direction, leaf 8l is nrst engaged with leaf 1l and thereafter leaf 10 is engaged with leaf 1|.

Power for operating the device is supplied to the conductor I2 and to a conductor 14 from any suitable source. The conductor I2 is connected both to the motor Il and electromagnet 50.' The conductor 1l is connected to the contact leaves 6l, 0l, 5I and I0. The contact leaves l! and .l are connected by the conductor Il to the motor. The contactleaves BI and 1l are connected by the conductor i8 to the motor. The contact leavesland v1li areconnected by a conductor 1i to the electromagnet Il.

a By means ofy these connections, the operation of the knob-82 in one direction completes a circuitfor operation of the motor Il in one direction while theoperatlon of said knobin the opposite direction runs v the motor in'the oppodte direction. Since the electromagnet yis not, energized by the operation ofvtheknob yO2. the resulting movement ofthe motor controls the setting oi' the rheostat Il.v V*When the knob 1! is operated in either direction, the first movement of the knob completes a circuit for the electromagnet 50 and thus throws the clutch member 24 into engagement with clutch member 8l to connect the motor to the tuning condenser 4l. Further movement of the knob 12 operates the motor H to adjust the condenser 4I. the operation of the knob in one direction resulting in movement of the condenser in one direction and operation of said knob in the opposite direction resulting in movement `of the condenser in the opposite direction. y v- From the foregoingrdescription it will be apparent that an individual control for both the volume and the tuning .of the radio is provided although a singlev motor isused to actuate both controls. No forethought is required on the part lof the operator to shift the selective clutch mechanism. It is only necessary that he select the proper switch knob for either tuning or volume control. a

The foregoing specification describes the invention in one of its preferred forms. The detailsthereofmaybevariedbythoselkilledinthe art without departing fromthe scope of the invention as defined in the appended-claims.

Ihe invention claimed is:

1. Remote control apparatus fora radio having a variable volume controlling element and a variable tuning element, said apparatus'including a reversible electric motor. power transmission mechanism, an electrically operated device adapted to control said transmission mechanism to connect said motor to operate either of said elements selectively. and remotely controlled electrical circuits adapted to operate said motor selectively in either direction and to operate said electrically operated device.

2. Control apparatus for a radio having a variable volume controlling element and a variable tuning element, said apparatus including a reversible `electric motor. power transmision mechanism, an electrically operated device adapted to control said n mechanism to connect said motor to operate either of said elements selectively, and electrical circuits adapted to operate said motor selectively in either direction and to operate said electrically operated device.

3. Control apparatus for a radio having a vari- I able volume controlling element and a variable tuning element, said apparatus including an electric motor, a shaft rotatable by said motor. a clutch member splined to said shaft, a pair of mating clutch members engageable thereby, means biasing said first mentioned clutch member toward engagement with one of said mating members, electromagnetic means adapted to move the same into engagement with the other of said mating members, transmission mechanism connecting each of said mating clutch members to operate one of said first mentioned elements, and an electric circuit adapted to operate said motor, a second electric circuit adapted to operate said electromagnetic means, a circuit controlling device adapted to operate said nrst mentioned circuit, and a second circuit controlling device adapted to operate both' of said circuits.

4. Control apparatus for a radio having a variable volume controlling element and a variable tuning element, said apparatus including an electric motor. power transmission mechanism. an electrically. operated device adapted to control said' transmission mechanism to connect said motor to operate either of said elements selectively, an electric circuit adapted to operate said motor, a second electric circuit adapted to operate said electrically operated device. a circuit controlling device adapted to control said nrst mentioned circuit, and a second circuit controlling device adapted to control both of said circuits.

5. Control apparatus for a radio having a variable volume controlling element and a variable tuning element, said apparatus including an electric motor, power transmission mechanism including clutch means adapted to connect said motor-to operate said elements, an electrically operated device adapted to operaie said clutch means to connect said motor to operate one of said elements, means biasing said clutch means in opposition thereto to connect said motor to operate the other of said elements, an electric circuit adapted to operate said motor, a second electric circuit adapted to operate said electrically operated device. a circuit controlling device adapted to control said first mentioned circuit,

and a second circuit controlling device adapted to control both o1' said circuits.

6. Control apparatus for a radio having a variable volume controlling element and a variable tuning element, saidv apparatus including an electric motor, power transmission mechanism, an electrically operated device adapted to control said transmission mechanism to connect said motor to operate either of said elements selectively, an electric circuit adapted to operate said motor, a second electric circuit adapted to y operate said electrically operated device, a circuit controlling device adapted to control said j rst mentioned circuit, and a second circuit controlling device adapted in a single'movement to control rst the second mentioned circuit and thereafter the first mentioned circuit.

JOSEPH M. Bm. 

